noun.
One who or that which folds; specifically, a flat knife-like instrument, frequently of bone or ivory, used in folding paper.
noun.
A circular, time-table, map, or other printed paper folded in such a way that it may be spread out in one sheet.
noun.
In entomology, one of many insects which fold leaves: as, the grape-leaf folder. See Desmia and leaf-folder.
noun.
An attachment to a sewing-machine for bending and folding the fabric previous to sewing. It is made in a great variety of forms to produce the different plaits, folds, and bands used in garment-making and in decorative sewing.
noun.
In sheet-metal work, a hand-power machine for folding over the edges of sheet-metal plates to form a lock, turning the edges of small tinware and roofing-plates, etc.: a tin-folding machine.